<template>
    <div class="list" ref="wrapper">
        <div>
        <div class="area">
            <div class="title border-topbottom">当前城市</div>
            <div class="button-list">
                <div class="button-wrapper" >
                    <div class="button">{{this.city}}</div>
                </div>
                </div>
            </div>
          <div class="area">
            <div class="title border-topbottom">热门城市</div>
            <div class="button-list">
                <div class="button-wrapper" v-for="item of hot" :key="item.id" @click="handleCityClick(item.name)">
                    <div class="button">{{item.name}}</div>
                </div>
                </div>
            </div>
        <div class="area" v-for ="(item,key) of cities" :key="key" :ref="key">
            <div class="title border-topbottom">{{key}}</div>
            <div class="item-list">
                <div class="item border-bottom" v-for="innerItem of item"
                :key="innerItem.id " @click="handleCityClick(innerItem.name)">{{innerItem.name}}</div>
            </div>
        </div>
        </div>
    </div>
</template>

<script>
import { mapState, mapMutations } from 'vuex'
import Bscroll from 'better-scroll'
export default {
  computed: {
    ...mapState(['city'])
  },
  name: 'CityList',
  props: {
    hot: Array,
    cities: Object,
    letter: String
  },
  methods: {
    handleCityClick (city) {
      this.changeCity(city)
    },
    ...mapMutations([
      'changeCity' // 将 `this.increment()` 映射为 `this.$store.commit('increment')`
    ])

  },

  watch: {
    letter () {
      if (this.letter) {
        const element = this.$refs[this.letter][0]
        this.scroll.scrollToElement(element)
      }
    }
  },
  mounted () {
    this.scroll = new Bscroll(this.$refs.wrapper)
  }
}
</script>

<style lang="stylus" scoped>
    .border-topbottom
        &:before
            border-color :#ccc
        &:after
            border-color :#ccc
    .border-bottom
        &:before
            border-color :#ccc
    .list
        overflow :hidden
        position :absolute
        top:1.68rem
        left:0
        right:0
        bottom :0
        .title
            line-height :.54rem
            background :#eee
            padding-left :.2rem
            color :#333
            font-size :.26rem
        .button-list
            overflow :hidden
            padding :.1rem .6rem .1rem .1rem
            .button-wrapper
                float :left
                width :33.33%
                .button
                    margin :.1rem
                    padding :.1rem 0
                    text-align :center
                    border :.02rem solid #ccc
                    border-radius :.06rem
        .item-list
            .item
                line-height :.76rem
                padding-left :.2rem

</style>
